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Annotation of 43BSDReno/usr.bin/window/ttoutput.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * This code is derived from software contributed to Berkeley by
                      6:  * Edward Wang at The University of California, Berkeley.
                      7:  *
                      8:  * Redistribution and use in source and binary forms are permitted provided
                      9:  * that: (1) source distributions retain this entire copyright notice and
                     10:  * comment, and (2) distributions including binaries display the following
                     11:  * acknowledgement:  ``This product includes software developed by the
                     12:  * University of California, Berkeley and its contributors'' in the
                     13:  * documentation or other materials provided with the distribution and in
                     14:  * all advertising materials mentioning features or use of this software.
                     15:  * Neither the name of the University nor the names of its contributors may
                     16:  * be used to endorse or promote products derived from this software without
                     17:  * specific prior written permission.
                     18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     21:  */
                     22: 
                     23: #ifndef lint
                     24: static char sccsid[] = "@(#)ttoutput.c 3.9 (Berkeley) 6/6/90";
                     25: #endif /* not lint */
                     26: 
                     27: #include "ww.h"
                     28: #include "tt.h"
                     29: #include <sys/errno.h>
                     30: 
                     31: /*
                     32:  * Buffered output package.
                     33:  * We need this because stdio fails on non-blocking writes.
                     34:  */
                     35: 
                     36: ttflush()
                     37: {
                     38:        register char *p;
                     39:        register n;
                     40:        extern errno;
                     41: 
                     42:        wwnflush++;
                     43:        for (p = tt_ob; p < tt_obp;) {
                     44:                wwnwr++;
                     45:                n = write(1, p, tt_obp - p);
                     46:                if (n < 0) {
                     47:                        wwnwre++;
                     48:                        if (errno != EWOULDBLOCK) {
                     49:                                /* can't deal with this */
                     50:                                p = tt_obp;
                     51:                        }
                     52:                } else if (n == 0) {
                     53:                        /* what to do? */
                     54:                        wwnwrz++;
                     55:                } else {
                     56:                        wwnwrc += n;
                     57:                        p += n;
                     58:                }
                     59:        }
                     60:        tt_obp = tt_ob;
                     61: }
                     62: 
                     63: ttputs(s)
                     64: register char *s;
                     65: {
                     66:        while (*s)
                     67:                ttputc(*s++);
                     68: }
                     69: 
                     70: ttwrite(s, n)
                     71:        register char *s;
                     72:        register n;
                     73: {
                     74:        switch (n) {
                     75:        case 0:
                     76:                break;
                     77:        case 1:
                     78:                ttputc(*s);
                     79:                break;
                     80:        case 2:
                     81:                if (tt_obe - tt_obp < 2)
                     82:                        (*tt.tt_flush)();
                     83:                *tt_obp++ = *s++;
                     84:                *tt_obp++ = *s;
                     85:                break;
                     86:        case 3:
                     87:                if (tt_obe - tt_obp < 3)
                     88:                        (*tt.tt_flush)();
                     89:                *tt_obp++ = *s++;
                     90:                *tt_obp++ = *s++;
                     91:                *tt_obp++ = *s;
                     92:                break;
                     93:        case 4:
                     94:                if (tt_obe - tt_obp < 4)
                     95:                        (*tt.tt_flush)();
                     96:                *tt_obp++ = *s++;
                     97:                *tt_obp++ = *s++;
                     98:                *tt_obp++ = *s++;
                     99:                *tt_obp++ = *s;
                    100:                break;
                    101:        case 5:
                    102:                if (tt_obe - tt_obp < 5)
                    103:                        (*tt.tt_flush)();
                    104:                *tt_obp++ = *s++;
                    105:                *tt_obp++ = *s++;
                    106:                *tt_obp++ = *s++;
                    107:                *tt_obp++ = *s++;
                    108:                *tt_obp++ = *s;
                    109:                break;
                    110:        default:
                    111:                while (n > 0) {
                    112:                        register m;
                    113: 
                    114:                        while ((m = tt_obe - tt_obp) == 0)
                    115:                                (*tt.tt_flush)();
                    116:                        if ((m = tt_obe - tt_obp) > n)
                    117:                                m = n;
                    118:                        bcopy(s, tt_obp, m);
                    119:                        tt_obp += m;
                    120:                        s += m;
                    121:                        n -= m;
                    122:                }
                    123:        }
                    124: }

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